User blog comment:Greninja20shiny/Electro web/@comment-33801918-20180602110608

Technically, Pikachu can learn Eletroweb by move tutor

Move tutor...

Also i think that Electro Ball was replaced because Ash told it to use electro ball when mimikyu attacked with Z-Move, but it turned out it used Electroweb and Electro Ball wasn't strong this episode wasn't it? Maybe this is showing that move is being replaced? Idk maybe Pikachu did some Mantine Surfes for bp and learned Electroweb at Move Tutor behind the scenes.